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source: lib/misc.c @ 36cf9fd

Last change on this file since 36cf9fd was 4cf80bb, checked in by Wilmer van der Gaast <wilmer@…>, at 2009-10-23T10:43:15Z
Shuffling a few more #includes. Much more shuffling will be needed.
Property mode set to `100644`
File size: 13.1 KB

Line
1	/********************************************************************\
2	* BitlBee -- An IRC to other IM-networks gateway *
3	* *
4	* Copyright 2002-2006 Wilmer van der Gaast and others *
5	\********************************************************************/
6
7	/*
8	* Various utility functions. Some are copied from Gaim to support the
9	* IM-modules, most are from BitlBee.
10	*
11	* Copyright (C) 1998-1999, Mark Spencer <markster@marko.net>
12	* (and possibly other members of the Gaim team)
13	* Copyright 2002-2006 Wilmer van der Gaast <wilmer@gaast.net>
14	*/
15
16	/*
17	This program is free software; you can redistribute it and/or modify
18	it under the terms of the GNU General Public License as published by
19	the Free Software Foundation; either version 2 of the License, or
20	(at your option) any later version.
21
22	This program is distributed in the hope that it will be useful,
23	but WITHOUT ANY WARRANTY; without even the implied warranty of
24	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25	GNU General Public License for more details.
26
27	You should have received a copy of the GNU General Public License with
28	the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
29	if not, write to the Free Software Foundation, Inc., 59 Temple Place,
30	Suite 330, Boston, MA 02111-1307 USA
31	*/
32
33	#define BITLBEE_CORE
34	#include "nogaim.h"
35	#include "base64.h"
36	#include <stdio.h>
37	#include <stdlib.h>
38	#include <string.h>
39	#include <ctype.h>
40	#include <glib.h>
41	#include <time.h>
42
43	#ifdef HAVE_RESOLV_A
44	#include <arpa/nameser.h>
45	#include <resolv.h>
46	#endif
47
48	#include "md5.h"
49	#include "ssl_client.h"
50
51	void strip_linefeed(gchar *text)
52	{
53	int i, j;
54	gchar *text2 = g_malloc(strlen(text) + 1);
55
56	for (i = 0, j = 0; text[i]; i++)
57	if (text[i] != '\r')
58	text2[j++] = text[i];
59	text2[j] = '\0';
60
61	strcpy(text, text2);
62	g_free(text2);
63	}
64
65	time_t get_time(int year, int month, int day, int hour, int min, int sec)
66	{
67	struct tm tm;
68
69	memset(&tm, 0, sizeof(struct tm));
70	tm.tm_year = year - 1900;
71	tm.tm_mon = month - 1;
72	tm.tm_mday = day;
73	tm.tm_hour = hour;
74	tm.tm_min = min;
75	tm.tm_sec = sec >= 0 ? sec : time(NULL) % 60;
76
77	return mktime(&tm);
78	}
79
80	typedef struct htmlentity
81	{
82	char code[7];
83	char is[3];
84	} htmlentity_t;
85
86	static const htmlentity_t ent[] =
87	{
88	{ "lt", "<" },
89	{ "gt", ">" },
90	{ "amp", "&" },
91	{ "quot", "\"" },
92	{ "aacute", "á" },
93	{ "eacute", "é" },
94	{ "iacute", "é" },
95	{ "oacute", "ó" },
96	{ "uacute", "ú" },
97	{ "agrave", "à" },
98	{ "egrave", "è" },
99	{ "igrave", "ì" },
100	{ "ograve", "ò" },
101	{ "ugrave", "ù" },
102	{ "acirc", "â" },
103	{ "ecirc", "ê" },
104	{ "icirc", "î" },
105	{ "ocirc", "ô" },
106	{ "ucirc", "û" },
107	{ "auml", "ä" },
108	{ "euml", "ë" },
109	{ "iuml", "ï" },
110	{ "ouml", "ö" },
111	{ "uuml", "ü" },
112	{ "nbsp", " " },
113	{ "", "" }
114	};
115
116	void strip_html( char *in )
117	{
118	char *start = in;
119	char *out = g_malloc( strlen( in ) + 1 );
120	char s = out, cs;
121	int i, matched;
122
123	memset( out, 0, strlen( in ) + 1 );
124
125	while( *in )
126	{
127	if( in == '<' && ( isalpha( (in+1) ) \|\| *(in+1) == '/' ) )
128	{
129	/* If in points at a < and in+1 points at a letter or a slash, this is probably
130	a HTML-tag. Try to find a closing > and continue there. If the > can't be
131	found, assume that it wasn't a HTML-tag after all. */
132
133	cs = in;
134
135	while( in && in != '>' )
136	in ++;
137
138	if( *in )
139	{
140	if( g_strncasecmp( cs+1, "br", 2) == 0 )
141	*(s++) = '\n';
142	in ++;
143	}
144	else
145	{
146	in = cs;
147	(s++) = (in++);
148	}
149	}
150	else if( *in == '&' )
151	{
152	cs = ++in;
153	while( in && isalpha( in ) )
154	in ++;
155
156	if( *in == ';' ) in ++;
157	matched = 0;
158
159	for( i = 0; *ent[i].code; i ++ )
160	if( g_strncasecmp( ent[i].code, cs, strlen( ent[i].code ) ) == 0 )
161	{
162	int j;
163
164	for( j = 0; ent[i].is[j]; j ++ )
165	*(s++) = ent[i].is[j];
166
167	matched = 1;
168	break;
169	}
170
171	/* None of the entities were matched, so return the string */
172	if( !matched )
173	{
174	in = cs - 1;
175	(s++) = (in++);
176	}
177	}
178	else
179	{
180	(s++) = (in++);
181	}
182	}
183
184	strcpy( start, out );
185	g_free( out );
186	}
187
188	char escape_html( const char html )
189	{
190	const char *c = html;
191	GString *ret;
192	char *str;
193
194	if( html == NULL )
195	return( NULL );
196
197	ret = g_string_new( "" );
198
199	while( *c )
200	{
201	switch( *c )
202	{
203	case '&':
204	ret = g_string_append( ret, "&" );
205	break;
206	case '<':
207	ret = g_string_append( ret, "<" );
208	break;
209	case '>':
210	ret = g_string_append( ret, ">" );
211	break;
212	case '"':
213	ret = g_string_append( ret, """ );
214	break;
215	default:
216	ret = g_string_append_c( ret, *c );
217	}
218	c ++;
219	}
220
221	str = ret->str;
222	g_string_free( ret, FALSE );
223	return( str );
224	}
225
226	/* Decode%20a%20file%20name */
227	void http_decode( char *s )
228	{
229	char *t;
230	int i, j, k;
231
232	t = g_new( char, strlen( s ) + 1 );
233
234	for( i = j = 0; s[i]; i ++, j ++ )
235	{
236	if( s[i] == '%' )
237	{
238	if( sscanf( s + i + 1, "%2x", &k ) )
239	{
240	t[j] = k;
241	i += 2;
242	}
243	else
244	{
245	*t = 0;
246	break;
247	}
248	}
249	else
250	{
251	t[j] = s[i];
252	}
253	}
254	t[j] = 0;
255
256	strcpy( s, t );
257	g_free( t );
258	}
259
260	/* Warning: This one explodes the string. Worst-cases can make the string 3x its original size! */
261	/* This fuction is safe, but make sure you call it safely as well! */
262	void http_encode( char *s )
263	{
264	char *t;
265	int i, j;
266
267	t = g_strdup( s );
268
269	for( i = j = 0; t[i]; i ++, j ++ )
270	{
271	/* if( t[i] <= ' ' \|\| ((unsigned char )t)[i] >= 128 \|\| t[i] == '%' ) /
272	if( !isalnum( t[i] ) )
273	{
274	sprintf( s + j, "%%%02X", ((unsigned char*)t)[i] );
275	j += 2;
276	}
277	else
278	{
279	s[j] = t[i];
280	}
281	}
282	s[j] = 0;
283
284	g_free( t );
285	}
286
287	/* Strip newlines from a string. Modifies the string passed to it. */
288	char strip_newlines( char source )
289	{
290	int i;
291
292	for( i = 0; source[i] != '\0'; i ++ )
293	if( source[i] == '\n' \|\| source[i] == '\r' )
294	source[i] = ' ';
295
296	return source;
297	}
298
299	/* Wrap an IPv4 address into IPv6 space. Not thread-safe... */
300	char ipv6_wrap( char src )
301	{
302	static char dst[64];
303	int i;
304
305	for( i = 0; src[i]; i ++ )
306	if( ( src[i] < '0' \|\| src[i] > '9' ) && src[i] != '.' )
307	break;
308
309	/* Hmm, it's not even an IP... */
310	if( src[i] )
311	return src;
312
313	g_snprintf( dst, sizeof( dst ), "::ffff:%s", src );
314
315	return dst;
316	}
317
318	/* Unwrap an IPv4 address into IPv6 space. Thread-safe, because it's very simple. :-) */
319	char ipv6_unwrap( char src )
320	{
321	int i;
322
323	if( g_strncasecmp( src, "::ffff:", 7 ) != 0 )
324	return src;
325
326	for( i = 7; src[i]; i ++ )
327	if( ( src[i] < '0' \|\| src[i] > '9' ) && src[i] != '.' )
328	break;
329
330	/* Hmm, it's not even an IP... */
331	if( src[i] )
332	return src;
333
334	return ( src + 7 );
335	}
336
337	/* Convert from one charset to another.
338
339	from_cs, to_cs: Source and destination charsets
340	src, dst: Source and destination strings
341	size: Size if src. 0 == use strlen(). strlen() is not reliable for UNICODE/UTF16 strings though.
342	maxbuf: Maximum number of bytes to write to dst
343
344	Returns the number of bytes written to maxbuf or -1 on an error.
345	*/
346	signed int do_iconv( char from_cs, char to_cs, char src, char dst, size_t size, size_t maxbuf )
347	{
348	GIConv cd;
349	size_t res;
350	size_t inbytesleft, outbytesleft;
351	char *inbuf = src;
352	char *outbuf = dst;
353
354	cd = g_iconv_open( to_cs, from_cs );
355	if( cd == (GIConv) -1 )
356	return( -1 );
357
358	inbytesleft = size ? size : strlen( src );
359	outbytesleft = maxbuf - 1;
360	res = g_iconv( cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft );
361	*outbuf = '\0';
362	g_iconv_close( cd );
363
364	if( res == (size_t) -1 )
365	return( -1 );
366	else
367	return( outbuf - dst );
368	}
369
370	/* A pretty reliable random number generator. Tries to use the /dev/random
371	devices first, and falls back to the random number generator from libc
372	when it fails. Opens randomizer devices with O_NONBLOCK to make sure a
373	lack of entropy won't halt BitlBee. */
374	void random_bytes( unsigned char *buf, int count )
375	{
376	#ifndef _WIN32
377	static int use_dev = -1;
378
379	/* Actually this probing code isn't really necessary, is it? */
380	if( use_dev == -1 )
381	{
382	if( access( "/dev/random", R_OK ) == 0 \|\| access( "/dev/urandom", R_OK ) == 0 )
383	use_dev = 1;
384	else
385	{
386	use_dev = 0;
387	srand( ( getpid() << 16 ) ^ time( NULL ) );
388	}
389	}
390
391	if( use_dev )
392	{
393	int fd;
394
395	/* At least on Linux, /dev/random can block if there's not
396	enough entropy. We really don't want that, so if it can't
397	give anything, use /dev/urandom instead. */
398	if( ( fd = open( "/dev/random", O_RDONLY \| O_NONBLOCK ) ) >= 0 )
399	if( read( fd, buf, count ) == count )
400	{
401	close( fd );
402	return;
403	}
404	close( fd );
405
406	/* urandom isn't supposed to block at all, but just to be
407	sure. If it blocks, we'll disable use_dev and use the libc
408	randomizer instead. */
409	if( ( fd = open( "/dev/urandom", O_RDONLY \| O_NONBLOCK ) ) >= 0 )
410	if( read( fd, buf, count ) == count )
411	{
412	close( fd );
413	return;
414	}
415	close( fd );
416
417	/* If /dev/random blocks once, we'll still try to use it
418	again next time. If /dev/urandom also fails for some
419	reason, stick with libc during this session. */
420
421	use_dev = 0;
422	srand( ( getpid() << 16 ) ^ time( NULL ) );
423	}
424
425	if( !use_dev )
426	#endif
427	{
428	int i;
429
430	/* Possibly the LSB of rand() isn't very random on some
431	platforms. Seems okay on at least Linux and OSX though. */
432	for( i = 0; i < count; i ++ )
433	buf[i] = rand() & 0xff;
434	}
435	}
436
437	int is_bool( char *value )
438	{
439	if( *value == 0 )
440	return 0;
441
442	if( ( g_strcasecmp( value, "true" ) == 0 ) \|\| ( g_strcasecmp( value, "yes" ) == 0 ) \|\| ( g_strcasecmp( value, "on" ) == 0 ) )
443	return 1;
444	if( ( g_strcasecmp( value, "false" ) == 0 ) \|\| ( g_strcasecmp( value, "no" ) == 0 ) \|\| ( g_strcasecmp( value, "off" ) == 0 ) )
445	return 1;
446
447	while( *value )
448	if( !isdigit( *value ) )
449	return 0;
450	else
451	value ++;
452
453	return 1;
454	}
455
456	int bool2int( char *value )
457	{
458	int i;
459
460	if( ( g_strcasecmp( value, "true" ) == 0 ) \|\| ( g_strcasecmp( value, "yes" ) == 0 ) \|\| ( g_strcasecmp( value, "on" ) == 0 ) )
461	return 1;
462	if( ( g_strcasecmp( value, "false" ) == 0 ) \|\| ( g_strcasecmp( value, "no" ) == 0 ) \|\| ( g_strcasecmp( value, "off" ) == 0 ) )
463	return 0;
464
465	if( sscanf( value, "%d", &i ) == 1 )
466	return i;
467
468	return 0;
469	}
470
471	struct ns_srv_reply srv_lookup( char service, char protocol, char domain )
472	{
473	struct ns_srv_reply *reply = NULL;
474	#ifdef HAVE_RESOLV_A
475	char name[1024];
476	unsigned char querybuf[1024];
477	const unsigned char *buf;
478	ns_msg nsh;
479	ns_rr rr;
480	int i, len, size;
481
482	g_snprintf( name, sizeof( name ), "_%s._%s.%s", service, protocol, domain );
483
484	if( ( size = res_query( name, ns_c_in, ns_t_srv, querybuf, sizeof( querybuf ) ) ) <= 0 )
485	return NULL;
486
487	if( ns_initparse( querybuf, size, &nsh ) != 0 )
488	return NULL;
489
490	if( ns_parserr( &nsh, ns_s_an, 0, &rr ) != 0 )
491	return NULL;
492
493	size = ns_rr_rdlen( rr );
494	buf = ns_rr_rdata( rr );
495
496	len = 0;
497	for( i = 6; i < size && buf[i]; i += buf[i] + 1 )
498	len += buf[i] + 1;
499
500	if( i > size )
501	return NULL;
502
503	reply = g_malloc( sizeof( struct ns_srv_reply ) + len );
504	memcpy( reply->name, buf + 7, len );
505
506	for( i = buf[6]; i < len && buf[7+i]; i += buf[7+i] + 1 )
507	reply->name[i] = '.';
508
509	if( i > len )
510	{
511	g_free( reply );
512	return NULL;
513	}
514
515	reply->prio = ( buf[0] << 8 ) \| buf[1];
516	reply->weight = ( buf[2] << 8 ) \| buf[3];
517	reply->port = ( buf[4] << 8 ) \| buf[5];
518	#endif
519
520	return reply;
521	}
522
523	/* Word wrapping. Yes, I know this isn't UTF-8 clean. I'm willing to take the risk. */
524	char word_wrap( char msg, int line_len )
525	{
526	GString *ret = g_string_sized_new( strlen( msg ) + 16 );
527
528	while( strlen( msg ) > line_len )
529	{
530	int i;
531
532	/* First try to find out if there's a newline already. Don't
533	want to add more splits than necessary. */
534	for( i = line_len; i > 0 && msg[i] != '\n'; i -- );
535	if( msg[i] == '\n' )
536	{
537	g_string_append_len( ret, msg, i + 1 );
538	msg += i + 1;
539	continue;
540	}
541
542	for( i = line_len; i > 0; i -- )
543	{
544	if( msg[i] == '-' )
545	{
546	g_string_append_len( ret, msg, i + 1 );
547	g_string_append_c( ret, '\n' );
548	msg += i + 1;
549	break;
550	}
551	else if( msg[i] == ' ' )
552	{
553	g_string_append_len( ret, msg, i );
554	g_string_append_c( ret, '\n' );
555	msg += i + 1;
556	break;
557	}
558	}
559	if( i == 0 )
560	{
561	g_string_append_len( ret, msg, line_len );
562	g_string_append_c( ret, '\n' );
563	msg += line_len;
564	}
565	}
566	g_string_append( ret, msg );
567
568	return g_string_free( ret, FALSE );
569	}
570
571	gboolean ssl_sockerr_again( void *ssl )
572	{
573	if( ssl )
574	return ssl_errno == SSL_AGAIN;
575	else
576	return sockerr_again();
577	}
578
579	/* Returns values: -1 == Failure (base64-decoded to something unexpected)
580	0 == Okay
581	1 == Password doesn't match the hash. */
582	int md5_verify_password( char password, char hash )
583	{
584	md5_byte_t *pass_dec = NULL;
585	md5_byte_t pass_md5[16];
586	md5_state_t md5_state;
587	int ret = -1, i;
588
589	if( base64_decode( hash, &pass_dec ) == 21 )
590	{
591	md5_init( &md5_state );
592	md5_append( &md5_state, (md5_byte_t*) password, strlen( password ) );
593	md5_append( &md5_state, (md5_byte_t) pass_dec + 16, 5 ); / Hmmm, salt! */
594	md5_finish( &md5_state, pass_md5 );
595
596	for( i = 0; i < 16; i ++ )
597	{
598	if( pass_dec[i] != pass_md5[i] )
599	{
600	ret = 1;
601	break;
602	}
603	}
604
605	/* If we reached the end of the loop, it was a match! */
606	if( i == 16 )
607	ret = 0;
608	}
609
610	g_free( pass_dec );
611
612	return ret;
613	}

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